coulter



wamm WITNESSES C. J. COULTER.

PORTABLE RAIL DRILL. APPLICATION FILED SEPLZ, 19w.

Patented Aug. 1, 1916.

2 SHEETSfSHEET 1.

C. J. COULTER.

PORTABLE RAIL DRI LL.

APPLICATION FILED SEPT-2.1913.

l l 93Ml Patented Aug. 1, 1916.

. 2 SHEETS SHEET 2- INEENTOR WITNESSES: 2 i 7K 0 M By I TTORNEYk ms Namus PEYERS co. PHaro-umm. wAsmNnrvm n. c.

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CHAIRLES J". COULTER, 0F HAMMOND, INDIANA.

PORTABLE RAIL-DRILL.

Application filed September 2, 1913.

To all whom it may concern Be it known that T, CHARLES J. CoUL'rnR,

a citizen of the United States, residing at Hammond, in the county of Lake and State;

of Indiana, have invented a certain new and useful Improvement in Portable Rail' Drills,

. quently happens. that the pawl will not have time to engage the ratchet and will not feed the drill at all, or else that it will catch the tooth in advance of the one intended to be engaged by it and feed too rapidly.

Another objectionable feature in these drills is due to the fact that when the drill in cutting through the rail engages a larger amount of metal than can cut off it is frequently broken or else has to be retracted.

My invention has for its object to provide a device which will provide for a quick return and also provide means for instantly freeing the drill without retracting it and without stopping its rotation in a cutting direction.

My means of accomplishing the foregoing may be more readily understood by having reference to the accompanying drawings, which are hereunto annexed and area part of this specification, in which:

Figure 1 is a vertical elevation, partly in section to show the complete arrangement of the drill. Fig. 2 is a vertical cross section taken in the line ww in the direction of the arrows as shown in Fig. 1. Fig. 3 is an enlarged detail view of one of the shifting collars showing the construction of the teeth and recesses. Fig. 4 is an end view of the same. Fig. 5 is'a fragmentary detail view showing the casing to protect the mechanism from dust, dirt, etc.

Similar reference numerals refer to similar partsthroughout the entire description.

As shown in the drawings, 1 indicates a frame of the usual construction, 2 the drill which is held in a chuck 3, which is rotated by a sprocket 4; secured to a sleeve 24:, WlllCll Specification of Letters Patent.

Fatented ring. 11 1913.

Serial No. 787,610.

is 'splinedto the chuck shank. The sprocket a is driven by a chain 5 carried by a sprocket 6 located in the upper part of the frame 1, the sprocket 6 being adapted to be rotated by a crank 7, which is provided with a handle 8 for the use of the operator.

9 is a pinion which issplined upon the chuck shank together with the sleeve 21, and engages a gear 10, which is loosely mounted upon a shaft 11 which is carried in bearings 12 and 13 cast or formed on the frame.

14-, is a shifting collar which is slidable upon a key 15 secured in the shaft 11.

One end of the shifting collar 1 1 is provided with teeth 16, which are adapted to engage recesses 17 formed in the outwardly extending hub of the gear 10. A pinion 18 is mounted upon the shaft 11 adjacent the bearing 12 and engages a gear 19, which is mounted upon threads 20 out upon the feed screw which is loosely secured to the chuck shank and splined in the shell 27.

21 is an operating lever, which connects the shifting collar 14: to a shifting collar 23 splined upon the sleeve 24.

The shifting collar 23 is provided with teeth 25 which are adapted to engage recesses 26 out upon the hub of the gear 19. A shell 27 is designed to protect the end of the feed screw from dust or dirt. The inner end of this shell 27 has a permanent key 33 secured thereto, which is adapted to slide in a. keyway 34: formed in the feed screw. This key way serves to prevent the rotation of the feed screw, and at the same time permits its free longitudinal movement. I provide a ball thrust bearing 28 to take up the end thrust on the drill.

The operation of the device is as follows:

As shown in Fig. 1, the rotation of the handle 8, carrying with it the sprocket 6 through the medium of the chain 5, rotates the sprocket a and in turn the chuck and drill, but the latter will remainin a stationary position as far as longitudinal movement is concerned, inasmuch as the gear 10 is loose upon the shaft 11.

' The operator desiring to cause his drill to feed, shifts the handle 29 which extends outwardly from the shifting lever 21, and is pivotally secured to the side wall of a casing 30 by means of a pivot or bolt 31. This shell or casing 30 is provided with an out wardly extending portion 32, which is at.- tached to the upper half 30 by means of bolts 33, or in any other convenient manner. The provision of this casing serves to elfectually protect all of the operative mechanism from contact with Cinders, sand, gravel, etc., which is almost always present in places where drills of that type are used. The movement of the collar 14 causes the teeth 16 to engage the recesses 1'? on the gear 10, with the result that the rotation of the pinion 9 through the medium of the sprocket causes the rotation of the gear 10. This in turn rotates the shaft 11, by reason of the fact that the collar 14 is splined upon the shaft 11, causing the pinion 18 to rotate the gear 19, which in turn advances the feed screw, the ratio of the gears being properly proportioned to advance the drill as rapidly as is consistent with good practice. Should the drill clog, a slight movement of the operators foot will disengage the teeth on the shifting collar, and thus release the feed and hence check the further advance of the drill. At the same time it will not interfere with the rotation of the drill at all, thus permitting it to free itself, without the slighest danger of breaking it.

When the hole is drilled the again shifts the lever 21, and in turn the collar 14, releasing the teeth, but does not stop it in the neutral position, but continues the movement, until the teeth 25 are brought into engagement with the recesses 26, when it is obvious that the gear 19 will be driven at the same speed as the sprocket 4, and as a consequence the drill will be rapidly withdrawn.

It will be apparent to persons skilled in operator 7 the art that the drill can also be rapidly advancedby the same method with a reverse movement of the handle, enabling the operator to place the drill in a cutting position very expeditiously.

Having described my invention, what I regard as new and desire to secure by Letters Patent is:

1. The combination in a portable drill, of a drill chuck, an externally threaded sleeve slidably and non-rotatably mounted on the shank of said chuck, driving means, a gear threaded 011 said sleeve, connections between said driving means and said gear, connections between said driving means and said chuck, means whereby connections between the driving means and gears may be broken vwithout aifecting the connections between the driving means and the chuck,

2. The combination with a portable drill, of a drill chuck having a shank, a sleeve splined on said shank, said sleeve having screw threads, a pinion secured to said sleeve, a gear in mesh with said pinion, a shaft on which said gear is loosely mounted, bearings for said shaft, a pinion rigidly se- Copies of this patent may be obtained for five cents each, by addressing the Commissioner cured on the other end of said shaft, a gear mounted on the feed screw, a shifting collar splined on said shaft having teeth thereon which engage recesses in the gear, a collar splined on said sleeve having teeth which engage recesses in the gear on the feed screw, means to shift said collars to cause the said teeth to engage either the loosely mounted gear or the threaded. gear, said means being adapted to permit the operator to place said collars in a neutral position, and means to rotate the sleeve.

3. The combination in a portable drill, of a drill chuck, a sleeve carried by the shank of said chuck, said sleeve having a. feed screw formed thereon, a sleeve splined on said shank, a pinion fixedly secured to said splined sleeve, a gear in mesh *ith said pinion, a shaft on which said gear is loosely mounted, a casing for inclosing the operative mechanism, bearings formed in said casing in which said shaft is mounted, and means adapted to be manually operated to cause the chuck to advance.

l. The combination in a portable drill, of a drill chuck, a sleeve carried by the shank of said chuck, said sleeve having a feed screw formed thereon, a cylinder casing inclosing the end of said feed screw and having a key mounted therein which engages a key-way cut in said feed screw, a sleeve spli ed on said shank in advance of the feed screw, a ball thrust bearing intermediate the ends of the feed screw and a shoulder formed on the shank, a pinion fixedly secured to the splined sleeve, a gear in mesh with said pinion, a shaft on which said gear is loosely mounted, a casing which incloscs the feeding mechanism, bearings formed in said casing in which said shaft is mounted, a pinion fixedly secured to the other end of said shaft, a gear mounted on the feed screw, a sprocket whc l mounted on said splined sleeve, and manually operated means to rotate said sprocket and sleeve.

5. The combination in a portable drill, of a drill chuck, a. sleeve splined on the shank on which is cut a feed screw, a. shell which incloscs the said feed screw, a key secured to the inner end of said shell, a keyway in said feed screw in which said key slides, a sleeve splined on said shank, means to retate said sleeve, a train of gears adapted to advance or retract said feed screw, and means to render said train of gears inoperative without interfering with the rotation of the splined sleeve.

In testimony whereof I have signed the foregoing specification.

CHARLES J. COULTER.

Witnesses K. Donner, C. M. BAUMEISTER.

of Patents,

Washington, D. 0. 

